A method for designing a compressor passage control component based on a bionic back ridge

Abstract

The embodiment of the application discloses a kind of based on bionic back ridge's compressor flow passage regulating component design method, this method includes: extracting back ridge contour curve from the back ridge specimen picture of Emydidae;Extract profile control point, obtain profile control point sequence;Based on profile control point sequence, generate two sides back ridge fitting curve;With target back ridge height and target upper end width as control variable, the two curves in two sides back ridge fitting curve are scaled and offset, to obtain the bionic back ridge section that keeps the original profile of two sides back ridge fitting curve;The blade geometry data of compressor static blade is fitted, to obtain the first back ridge position parameter and the second back ridge position parameter associated with compressor static blade, and then obtain back ridge axial guide profile;The position and posture of bionic back ridge section are adjusted, lofting is carried out along back ridge axial guide profile, to generate three-dimensional bionic back ridge structure;Three-dimensional bionic back ridge structure is used as compressor flow passage regulating component, integrated in compressor flow passage.

Description

Technical Field

[0001] This application relates to the field of turbomachinery flow control technology, and relates to, but is not limited to, a design method for compressor flow channel control components based on a biomimetic spine. Background Technology

[0002] Turbomachinery, as a core energy conversion equipment, is widely used in aerospace propulsion systems, marine power propulsion systems, and the energy and chemical industries; among them, aero-engines and gas turbines are key areas with core competitiveness. As a core component of aero-engines and gas turbines, the compressor's performance directly determines the overall thrust-to-weight ratio, thermal efficiency, and reliability. With the development of aviation technology towards higher thrust-to-weight ratios and higher maneuverability, compressors must simultaneously meet the dual requirements of increasing overall load and reducing the number of stages while increasing the load per stage, in order to reduce the overall weight and complexity. Heavy-duty gas turbines also place urgent demands on compressors for "high load, high efficiency, and high reliability."

[0003] However, with the continuous increase in compressor load, the flow characteristics within the blade channel changed significantly. On the one hand, the lateral pressure gradient effect within the blade channel was significantly enhanced due to the increased load; on the other hand, the reverse pressure gradient was exacerbated by the expansion or contraction of the channel. These two factors combined induced a three-dimensional flow separation phenomenon within the blade channel. The low-energy fluid within the endwall and blade surface boundary layer no longer followed the mainstream motion but instead migrated laterally towards the suction surface, accumulating near the suction surface to form separation vortices.

[0004] Although flow separation can be considered a self-organizing phenomenon in the flow field, its unsteady effects can have a significant negative impact on compressor performance. At best, it increases flow losses and reduces the compressor's isentropic efficiency; at worst, it can cause flow field instability, severely affecting system stability and even leading to engine failure. Summary of the Invention

[0005] In view of this, embodiments of this application provide a design method for a compressor flow channel control component based on a biomimetic spine, which at least solves the problem of flow separation in the compressor end region.

[0006] The technical solution of this application embodiment is implemented as follows:

[0007] In a first aspect, embodiments of this application provide a design method for a compressor flow channel control component based on a biomimetic spine, including:

[0008] Obtain an image of a leatherback turtle's dorsal spine specimen, extract the dorsal spine contour curve from the image, extract contour control points from the dorsal spine contour curve to obtain a contour control point sequence, and generate fitting curves for both sides of the dorsal spine based on the contour control point sequence.

[0009] Using the target spine height and the target upper width as control variables, two curves in the fitting curves of the two spines on both sides are scaled and offset to obtain a bionic spine cross section that maintains the original contour of the fitting curves of the two spines on both sides. The lower width of the bionic spine cross section is determined based on the target spine height, the target upper width and the shape of the original contour.

[0010] Obtain the blade geometry data of the compressor stationary blade, fit the blade geometry data to obtain the first back ridge position parameter associated with the compressor stationary blade; determine the second back ridge position parameter based on the first back ridge position parameter, and obtain the back ridge axial guide profile based on the first back ridge position parameter and the second back ridge position parameter.

[0011] Based on the lower end width, the position parameters of the third spine are determined; after adjusting the position and posture of the bionic spine section according to the second spine position parameters and the third spine position parameters, it is laid out along the spine axial guide line to generate a three-dimensional bionic spine structure; the three-dimensional bionic spine structure is integrated into the compressor flow channel as a compressor flow channel control component.

[0012] The beneficial effects of the technical solutions provided in this application include at least the following:

[0013] This application provides a design method for compressor flow channel control components based on a biomimetic dorsal spine. The method involves acquiring images of leatherback turtle dorsal spine specimens and extracting the dorsal spine contour curve from these images. By transforming the physical morphology of the leatherback turtle dorsal spine into a quantifiable two-dimensional curve, a geometric basis is provided for subsequent biomimetic dorsal spine design. Contour control points are extracted from the dorsal spine contour curve, resulting in a contour control point sequence. The density between every two contour control points is increased to address the problem of insufficient key point density and enhance local curvature details. Based on the contour control point sequence, fitting curves for both sides of the dorsal spine are generated. Symmetrical mapping is performed on one side of the fitted dorsal spine curve to address the slight asymmetry of the original leatherback turtle dorsal spine specimen. Two curves from the fitting curves on both sides of the dorsal spine are scaled and offset to obtain a biomimetic dorsal spine cross-section that retains the original contour of the fitting curves on both sides. Through scaling and offset operations, the fixed contour of the leatherback turtle dorsal spine's biological morphology is transformed into an engineering-adjustable parametric model, generating a biomimetic dorsal spine cross-section while preserving the fluid control advantages of the leatherback turtle dorsal spine. Obtain the blade geometry data of the compressor stationary blades. Based on this data, determine the path for lofting the biomimetic ridge section. The axial guide profile of the ridge ensures the three-dimensional biomimetic ridge structure extends along the flow channel. Adjust the position and attitude of the biomimetic ridge section according to the second and third ridge position parameters, and loft it along the axial guide profile to generate the three-dimensional biomimetic ridge structure. Avoid deviations in the adjusted position and attitude due to angular deviations, which could lead to additional flow losses. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0015] Figure 1 A flowchart illustrating a design method for a compressor flow channel control component based on a biomimetic spine, provided for an embodiment of the present invention;

[0016] Figure 2 This is a diagram of the biomimetic structure extraction provided in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the biomimetic spine control structure provided in an embodiment of the present invention;

[0018] Figure 4 Provided for embodiments of the present invention Figure 3 A cross-sectional view of the biomimetic spine control structure in China;

[0019] Figure 5 This is a schematic diagram of the stationary blade geometry provided in an embodiment of the present invention;

[0020] Figure 6 This is a top view of the stationary blade positioning profile provided in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the compressor flow channel provided in an embodiment of the present invention;

[0022] Figure 8 Provided for embodiments of the present invention Figure 7 BB cross-sectional view of the flow channel of the intermediate-pressure air compressor;

[0023] Figure 9 Provided for embodiments of the present invention Figure 7 CC cross-sectional view of the flow channel of the intermediate-pressure air compressor;

[0024] Figure 10 Distribution diagram of total outlet pressure loss coefficient along dimensionless blade height provided for embodiments of the present invention;

[0025] Figure label:

[0026] Compressor flow channel -1; Stationary blade -2; Three-dimensional bionic spine structure -3; Stationary blade suction surface section -201; Stationary blade pressure surface section -202; Leading edge positioning line -203; Axial positioning line -204; Deflection positioning line -205; Suction surface positioning line -206; Stationary blade positioning point -207; Trailing edge section -208; Leading edge section -209; Lower end line of bionic spine section -301; Upper end line of bionic spine section -302; Fitting curve of spine on both sides -303; Axial guide line of spine -304; Bionic spine positioning point -305; Target upper width - w 1 Bottom width - w 2 Target spine height - H ; Static blade chord length - L ; Axial chord length of stationary blade - L x ; circumferential chord length of stationary blade - L y Third preset distance - N 1 Fourth preset distance - N 2 Deflection angle - θ ; L b - Three-dimensional bionic spine chord length. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0029] It should be noted that the terms "first, second, and third" used in the embodiments of this application are merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, and third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application pertain. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] This application provides a design method for a compressor flow channel control component based on a biomimetic spine. Figure 1 A flowchart illustrating a design method for a compressor flow channel control component based on a biomimetic spine, as provided in this application embodiment, is shown below. Figure 1 As shown, the method includes at least the following steps:

[0032] Step S110: Obtain an image of the leatherback turtle's dorsal spine specimen; extract the dorsal spine contour curve from the dorsal spine specimen image; extract the contour control points of the dorsal spine contour curve to obtain a contour control point sequence; and generate a fitting curve 303 for both sides of the dorsal spine based on the contour control point sequence.

[0033] For a single leatherback turtle specimen, multiple perspective images were taken using a high-resolution DSLR camera or a professional 3D scanning device with its accompanying photographic module. Shooting points were set at fixed strides along the turtle's dorsal spine from head to tail, with additional shots taken from different angles on the same area, resulting in multiple cross-sectional images of the turtle's back. Through manual comparison combined with quantitative analysis using image quality assessment software, the image with the best overall quality was selected as the specimen image.

[0034] High-resolution and low-interference images of the vertebral specimens determine the accuracy and reliability of subsequent curve fitting results.

[0035] The core feature of the leatherback tortoise's dorsal spine is its longitudinally extending ridge contour structure, which needs to be located as the target for contour extraction. Key points are added to images of the leatherback tortoise's dorsal spine specimen, and the dorsal spine contour curve is extracted based on these key points. This extraction of the dorsal spine contour curve transforms the physical morphology of the leatherback tortoise's dorsal spine into a quantifiable two-dimensional curve, providing a geometric basis for the subsequent design of a biomimetic dorsal spine cross-section.

[0036] The extracted dorsal contour curve may have the following problems: (1) Insufficient key point density: the added key points may miss local curvature details. (2) Noise may be introduced when acquiring or extracting the dorsal contour curve from the image. (3) The dorsal specimen of leatherback turtle may have slight asymmetry.

[0037] To address the above issues, contour control points are extracted from the spine contour curve, resulting in a sequence of contour control points. The distance between contour control points is smaller than the distance between keypoints, effectively increasing the density between every two contour control points, thus resolving the problem of insufficient keypoint density and increasing local curvature details. This ensures that the subsequently obtained biomimetic spine cross-section accurately reproduces the biomechanical characteristics of the leatherback tortoise's spine.

[0038] Furthermore, based on the sequence of contour control points, fitting curves for both sides of the spine are generated. During the fitting process, noise points are deleted or modified to ensure that all contour control points are fitted onto a smooth curve. Symmetrical mapping is then applied to one side of the fitted spine curve to resolve the slight asymmetry issue of the original leatherback turtle spine specimen. Based on this, the effectiveness of subsequent three-dimensional biomimetic spine structures in suppressing secondary vortices in the compressor end region is improved, thereby enhancing flow field uniformity and compressor efficiency.

[0039] Step S120, with the target spine height H and the top width of the target w 1 To control variables, two curves in the fitting curves 303 on both sides of the spine are scaled and offset to obtain a biomimetic spine cross-section that maintains the original contour of the fitting curves 303 on both sides of the spine. The lower width of the biomimetic spine cross-section is... w 2 Based on the target spine height H The upper width of the target w 1 The shape of the original contour is determined;

[0040] The original contour of the bionic spine is a fixed contour. The spine height and upper width of the bionic spine cross-section are controlled variables, while the lower width of the bionic spine varies with the spine height and upper width. Therefore, by changing the spine height and upper width of the bionic spine cross-section according to different needs, different bionic spine cross-sections can be obtained, thereby determining different three-dimensional bionic spine structures.

[0041] The program adds offsets to the two curves in the fitting lines of the bionic spine on both sides, where twice the offset on each side is the upper width of the bionic spine.

[0042] Because different compressor channels have different heights, scaling is used to adapt the height of the ridge section to the actual channel space. Proportional scaling ensures that the original contour curvature ratio of the ridge remains unchanged, preserving the hydrodynamic advantages of the original biological contour. The lower width of the biomimetic ridge section is automatically calculated based on the original contour shape, avoiding flow field distortion caused by manual intervention.

[0043] Scaling and offset operations transform the fixed contour of the leatherback turtle's basal body into engineering-adjustable parameters. While preserving the fluid control advantages of the leatherback turtle's basal body, they achieve precise matching with the compressor channel size and stationary blade distribution, ultimately improving the flow stability of the compressor channel under high-load conditions.

[0044] Step S130: Obtain the blade geometry data of the compressor stationary blade 2, fit the blade geometry data to obtain the first back ridge position parameter associated with the compressor stationary blade 2; determine the second back ridge position parameter based on the first back ridge position parameter; and obtain the back ridge axial guide profile 304 based on the first back ridge position parameter and the second back ridge position parameter.

[0045] The compressor stationary blades are non-rotating blades fixed to the end of the compressor flow channel wall. The function of the compressor stationary blades is to guide the airflow direction and diffuse the airflow inside the compressor.

[0046] Based on the blade geometry data of the compressor stationary blades, the first and second back ridge position parameters are obtained, and the starting point and extension path of the axial guide line of the back ridge are derived to ensure that the obtained three-dimensional bionic back ridge structure works in coordination with the compressor stationary blades.

[0047] The axial guide profile of the spine provides a path for the layout of the biomimetic spine section, ensuring that the three-dimensional biomimetic spine structure extends along the flow channel. The axial guide profile of the spine inherits the streamline trend of the suction surface of the compressor stationary blades, so that the shape of the three-dimensional biomimetic spine structure naturally integrates into the flow field of the compressor and suppresses secondary vortices in the compressor.

[0048] Step S140, based on the lower end width w 2 The third ridge position parameters are determined; the position and posture of the bionic ridge section are adjusted according to the second ridge position parameters and the third ridge position parameters, and then laid out along the ridge axis guide line 304 to generate a three-dimensional bionic ridge structure 3; the three-dimensional bionic ridge structure 3 is used as a compressor flow channel control component and integrated into the compressor flow channel 1.

[0049] When lofting the biomimetic spine section, corresponding positioning is required in two locations. The first location is the positioning on the biomimetic spine section, and the second location is the positioning of the stationary blades inside the compressor where the biomimetic spine section is lofted. Then, the positioning of the two locations is matched, and the biomimetic spine section is lofted along the spine axial guide line to generate a three-dimensional biomimetic spine structure.

[0050] The third ridge position parameter of the biomimetic ridge section is determined. The third ridge position parameter provides a positioning reference on the biomimetic ridge section, ensuring accurate positioning of the biomimetic ridge section during lofting. The three-dimensional biomimetic ridge structure generated by lofting along the axial guide profile of the biomimetic ridge section works in conjunction with the flow field of the compressor stationary blades to avoid position and attitude deviations caused by angular deviations, thus avoiding additional flow losses.

[0051] By adjusting the size and shape of the biomimetic spine cross-section, as well as the position parameters of the first and second spines, different three-dimensional biomimetic spine structures can be constructed, allowing for rapid adaptation to different compressor channel dimensions. While maintaining the original channel structure, integrating the three-dimensional biomimetic spine structure into the channel wall reduces cost and significantly optimizes the compressor's aerodynamic performance and operational stability.

[0052] This application provides a design method for compressor flow channel control components based on a biomimetic dorsal spine. The method involves acquiring images of leatherback turtle dorsal spine specimens and extracting the dorsal spine contour curve from these images. By transforming the physical morphology of the leatherback turtle dorsal spine into a quantifiable two-dimensional curve, a geometric basis is provided for subsequent biomimetic dorsal spine design. Contour control points are extracted from the dorsal spine contour curve, resulting in a contour control point sequence. The density between every two contour control points is increased to address the problem of insufficient key point density and enhance local curvature details. Based on the contour control point sequence, fitting curves for both sides of the dorsal spine are generated. Symmetrical mapping is performed on one side of the fitted dorsal spine curve to address the slight asymmetry of the original leatherback turtle dorsal spine specimen. Two curves from the fitting curves on both sides of the dorsal spine are scaled and offset to obtain a biomimetic dorsal spine cross-section that retains the original contour of the fitting curves on both sides. Through scaling and offset operations, the fixed contour of the leatherback turtle dorsal spine's biological morphology is transformed into an engineering-adjustable parametric model, generating a biomimetic dorsal spine cross-section while preserving the fluid control advantages of the leatherback turtle dorsal spine. Obtain the blade geometry data of the compressor stationary blades. Based on this data, determine the path for lofting the biomimetic ridge section. The axial guide profile of the ridge ensures the three-dimensional biomimetic ridge structure extends along the flow channel. Adjust the position and attitude of the biomimetic ridge section according to the second and third ridge position parameters, and loft it along the axial guide profile to generate the three-dimensional biomimetic ridge structure. Avoid deviations in the adjusted position and attitude due to angular deviations, which could lead to additional flow losses.

[0053] In some embodiments, step S110, "extracting the dorsal contour curve from the dorsal specimen image," includes:

[0054] Step S1101: Import the image of the spine specimen into the Catia software;

[0055] Step S1102: Using the key point addition function of the Catia software, add a key point every first preset distance along the ridge outline of the leatherback turtle's back in the image of the turtle's back to obtain multiple key points.

[0056] Step S1103: Using the curve fitting function of the Catia software, the multiple key points are connected sequentially with curves to obtain the spine contour curve.

[0057] Catia is a 3D digital design and engineering software used in aerospace, automotive manufacturing, and industrial product development, supporting end-to-end digital solutions from conceptual design and detailed modeling to production. Catia's keypoint addition and curve fitting functions can accurately process images of leatherback tortoise carapace specimens.

[0058] Figure 2 This is a diagram of the biomimetic structure extraction provided in an embodiment of the present invention.

[0059] like Figure 2 As shown on the left, the image of the turtle's spine specimen is imported into Catia software, forming a separate component layer. Using the keypoint addition function, keypoints are added along the spine outline of the leatherback turtle at a first preset distance within a separate layer, resulting in multiple keypoints. Using Catia software's curve fitting function, multiple keypoints are connected with a curve of a bright color (e.g., red) to obtain the spine outline curve. For example, the first preset distance can be set to 2% of the scale of the turtle's spine specimen image.

[0060] In this process, the spine contour curve is separated from the spine specimen image layer so that the spine contour curve can be extracted later.

[0061] In some embodiments, step S110, "extracting the contour control points of the spine contour curve to obtain a contour control point sequence," includes:

[0062] Step S1104: Using the coordinate calibration function of GetData, the line connecting the lowest points of the two sides of the spine contour curve is used as the x-axis, and a perpendicular line is drawn from the vertex of the spine contour curve to the line connecting the lowest points, and the perpendicular line is used as the y-axis to establish a two-dimensional coordinate system.

[0063] Step S1105: Using the segmented sampling function of GetData, along the x-axis direction in the two-dimensional coordinate system, between adjacent key points, the encrypted points in the spine contour curve are extracted at a second preset distance. The key points and the encrypted points are arranged according to the x-axis coordinate size to obtain the contour control point sequence; the second preset distance is less than the first preset distance.

[0064] like Figure 2As shown in (middle), the red spine curve is regarded as a symmetrical spine curve. The line connecting the lowest points of the spine contour curve is taken as the x-axis. A perpendicular line is drawn from the vertex of the spine contour curve to the line connecting the lowest points, and the perpendicular line is taken as the y-axis. Ensure that the ratio of the length of the x-axis to the y-axis is consistent with the ratio of the spine contour curve.

[0065] Using the brown background of the vertebral specimen image as the background color and the red vertebral outline curve as the line segment, data points are encrypted between adjacent keypoints in x-axis order to obtain an encrypted contour control point sequence. The x-coordinate density between any two adjacent contour control points in the sequence is increased. For example, if the x-coordinate distance between any two adjacent contour control points was originally 0.03 times the scale of the vertebral specimen image, after data point encryption, the x-coordinate distance between any two adjacent contour control points in the sequence increases to 0.01 times the scale of the vertebral specimen image.

[0066] During the extraction of the spine contour curve, redundant noise may appear due to equipment precision limitations, image noise, or human error. These noise points do not accurately reflect the characteristic points of the leatherback turtle's spine morphology; rather, they are irrelevant or erroneous interference data. Retaining them would affect the realism of the subsequent biomimetic spine design. Therefore, redundant noise points in the contour control points are removed, and the resulting contour control points are stored as a contour control point sequence.

[0067] In some embodiments, step S110, "generating bilateral ridge fitting curves 303 based on the contour control point sequence", includes:

[0068] Step S1106: Select control points with positive x-axis coordinates from the contour control point sequence to obtain positive control points;

[0069] Step S1107: Using the first curve fitting model, optimize the distribution of the positive control points on the y-axis, and fit the positive control points onto a smooth curve to obtain the right ridge fitting curve.

[0070] Step S1108: The right back spine fitting curve is symmetrically mapped with the y-axis as the axis of symmetry to generate the left back spine fitting curve; the right back spine fitting curve and the left back spine fitting curve together constitute the two back spine fitting curves 303.

[0071] Because leatherback turtle specimens may have slight asymmetry along their dorsal spine, such as Figure 2 As shown in (right), control points with positive x-axis coordinates are extracted from the contour control point sequence to obtain positive control points. The ExpGro2 model is used to fit the coordinates of the positive x-axis points to obtain the fitting curve for the right ridge. The fitting process is shown in formula (1):

[0072] Formula (1);

[0073] In formula (1), is the dependent variable, representing the ordinate fitting value of the spine fitting curve at the x-axis; is the independent variable, representing the x-axis of the spine fitting curve; For the first exponential function, To control the first exponential function The magnitude and the fitting coefficient of the weights; It is the second exponential function; To control the second exponential function The magnitude and the fitting coefficient of the weights; Indicates the offset. and These are the morphological adjustment parameters for the fitted curve of the spine.

[0074] The right-side spine fitting curve is symmetrically mapped about the y-axis to generate the left-side spine fitting curve. This symmetry mapping involves flipping the coordinate signs to copy the right-side spine fitting curve to the left, resulting in the left-side spine fitting curve. Both spine fitting curves are symmetrical about the y-axis in a two-dimensional coordinate system.

[0075] In some embodiments, in step S120, "with the target spine height" H and the top width of the target w 1 To control variables, two curves in the fitting curves 303 on both sides of the spine are scaled and offset to obtain a biomimetic spine cross-section that maintains the original contour of the fitting curves 303 on both sides of the spine, including:

[0076] Step S1201: Determine the target spine height of the fitting curves 303 on both sides of the spine. H ;

[0077] Step S1202: Scale the two curves of the fitted curves 303 on both sides of the spine along the y-axis until the height of the two curves reaches the target spine height. H ;

[0078] Step S1203: Determine the target upper width of the fitting curve 303 of the two lateral spines. w 1 ;

[0079] Step S1204: The two curves of the fitted curves 303 on both sides of the spine are shifted in opposite directions on the x-axis until the distance between the upper ends of the two curves is equal to the upper width of the target. w 1 ;

[0080] Step S1205: After scaling and offsetting the fitting curves 303 on both sides of the back, a biomimetic back cross section that maintains the original contour of the fitting curves 303 on both sides of the back is obtained.

[0081] Figure 3 This is a geometric schematic diagram of the biomimetic spine control structure provided in an embodiment of the present invention. Figure 4 for Figure 3 A cross-sectional view of the biomimetic spine control structure.

[0082] like Figure 4 As shown, the spine section is set to maintain the spine outline by scaling the left and right curves of the spine fitting curves on both sides. The target spine height of the bionic spine section is the control variable, and the target upper width is the offset of the spine fitting curves on both sides.

[0083] The two curves fitted to the two ridges are offset in opposite directions along the x-axis until the distance between their upper ends equals the target upper width. The two curves do not offset left or right simultaneously; instead, when the left curve offsets to the left, the right curve offsets to the right by the same amount. Conversely, when the left curve offsets to the right, the right curve offsets to the left by the same amount. Twice the offset amount corresponds to the target upper width of the upper line 302 of the bionic ridge section. The lower width of the lower line 301 of the bionic ridge section is determined by the target ridge height of the bionic ridge section and the target upper width obtained through offsetting.

[0084] In some embodiments, the "first ridge position parameter" in step S130 includes the leading edge positioning line 203 and the axial positioning line 204; in step S130, "acquiring the blade geometry data of the compressor stationary blade 2, fitting the blade geometry data to obtain the first ridge position parameter associated with the compressor stationary blade 2" includes:

[0085] Step S1301: Obtain the suction surface data, leading edge data, and chord length of the stationary blade. L ;

[0086] Step S1302: Based on the static blade suction surface segment data, extract the coordinate control points of the static blade suction surface segment 201 to obtain a three-dimensional suction surface segment control point sequence.

[0087] Step S1303: Based on the leading edge segment data, determine the leading edge positioning line 203;

[0088] Step S1304: Offset the leading edge positioning line 203 by a third preset distance along the negative x-axis direction. N 1At that point, draw a line parallel to the leading edge positioning line 203 to generate the axial positioning line 204.

[0089] Figure 5 This is a schematic diagram of the stationary blade provided in an embodiment of the present invention. Figure 6 The image shows the top view of the stationary blade positioning profile provided in an embodiment of the present invention.

[0090] like Figure 5 and Figure 6 As shown, the three-dimensional compressor stationary blade includes a stationary blade suction surface section 201, a stationary blade pressure surface section 202, a leading edge section 209, and a trailing edge section 208.

[0091] The geometric data of the compressor stationary blades include the suction surface data, leading edge data, and chord length. The chord length is the distance between the leading edge and trailing edge of the stationary blade.

[0092] On the horizontal plane where the compressor stationary blades are located, the direction of the line connecting the leading edge to the trailing edge is taken as the positive direction of the x-axis; the direction perpendicular to the x-axis from the pressure surface to the suction surface of the stationary blade is taken as the y-axis. The vertical height direction of the compressor stationary blades is taken as the z-axis. A three-dimensional coordinate system is established based on the x-axis, y-axis, and z-axis.

[0093] After establishing a three-dimensional coordinate system based on the stationary blade, the data of the stationary blade suction surface section, the data of the stationary blade leading edge section, and the chord length of the stationary blade are obtained based on the coordinate control points of the stationary blade suction surface section, stationary blade pressure surface section, leading edge section and trailing edge section in the three-dimensional coordinate system.

[0094] The third preset distance represents the distance between the axial positioning line and the leading edge positioning line.

[0095] In some embodiments, the "second back ridge position parameter" in step S130 includes the suction surface positioning line 206, the stationary blade positioning point 207, and the deflection positioning line 205; in step S130, "determining the second back ridge position parameter based on the first back ridge position parameter, and obtaining the back ridge axial guide profile 304 based on the first back ridge position parameter and the second back ridge position parameter" includes:

[0096] Step S1305: Based on the second curve fitting model, the sequence of control points of the suction surface segment is fitted to obtain the fitting formula of the suction surface positioning line 206.

[0097] Step S1306, based on the leading edge positioning line 203 and the fourth preset distance N 2 Determine the starting point of the suction surface positioning line 206;

[0098] Step S1307: Based on the starting point of the suction surface positioning line 206 and the fitting formula, the suction surface positioning line 206 is positioned.

[0099] Step S1308: Based on the intersection of the suction surface positioning line 206 and the axial positioning line 204, determine the stationary blade positioning point 207;

[0100] Step S1309: The stationary blade positioning point 207 is determined as the starting point of the axial guide profile 304 of the spine;

[0101] Step S1310, based on the chord length of the stationary blade L Determine the length of the axial guide profile 304 of the spine;

[0102] Step S1311: Using the stationary blade positioning point 207 as the rotation center, rotate the axial positioning line 204 by a preset deflection angle. θ The deflection positioning line 205 is obtained;

[0103] Step S1312: Based on the starting point of the spine axial guide profile 304, the length of the spine axial guide profile 304, the deflection positioning line 205 and the suction surface positioning line 206, determine the spine axial guide profile 304 and position the spine axial guide profile 304.

[0104] Based on the data of the suction surface segment of the stationary blade, the coordinate control points of the suction surface segment are extracted to obtain a three-dimensional sequence of control points for the suction surface segment. The abscissa of the coordinate control points of the stationary blade suction surface segment is defined as the abscissa of the biomimetic spine axial guide profile; the ordinate of the coordinate control points of the stationary blade suction surface segment is defined as the ordinate of the biomimetic spine axial guide profile.

[0105] The second curve fitting model can be the ExpDec1 model. The second curve fitting model is used to fit the control point sequence of the suction surface segment of the stationary blade, resulting in the fitting formula for the suction surface positioning line, as shown in formula (2):

[0106] Formula (2);

[0107] In formula (2), Y 2 This represents the ordinate of the suction surface positioning line; Represents the natural exponential function term; Indicates the x-coordinate of the suction surface positioning line; t 3 It represents a quantitative parameter that reflects the rate of change of the suction surface positioning line index; B 1 This represents the amplitude coefficient preceding the exponential function; B2 This represents a constant term, indicating the longitudinal offset of the suction surface positioning line.

[0108] Based on the chord length of the stationary blades, the length of the axial guide profile of the spine is determined. For example, the length of the axial guide profile of the spine is determined to be 75% of the chord length of the stationary blades. The fourth preset distance is the distance between the suction surface positioning line and the suction surface segment.

[0109] The length of the axial guide line of the spine is determined as the chord length of the biomimetic spine. The starting point of the axial guide line of the spine is determined as the starting point of the axial guide line of the spine. The curvature of the curve where the suction surface positioning line is located is used as the curvature of the axial guide line of the spine. The axial guide line of the spine is perpendicular to the deflection positioning line. Then, the axial guide line of the spine is determined according to its length.

[0110] In some embodiments, the "third spine position parameter" in step S140 includes the bionic spine positioning point 305 and the lower end width. w 2 In step S140, "based on the lower end width" w 2 The third ridge position parameters are determined; after adjusting the position and orientation of the bionic ridge section according to the second and third ridge position parameters, it is laid out along the axial guide line 304 of the ridge to generate a three-dimensional bionic ridge structure 3", including:

[0111] Step S1401, the lower end width w 2 The midpoint is used as the positioning point 305 for the bionic spine;

[0112] Step S1402: The bionic spine section is positioned according to the bionic spine positioning point 305 and the lower end width. w 2 After the deflection positioning line 205, the stationary blade positioning point 207 and the suction surface positioning line 206 are adjusted in position and posture, they are laid out along the spine axis guide line 304 to generate a three-dimensional bionic spine structure 3.

[0113] In some embodiments, in step S1402, "the bionic spine section is positioned according to the bionic spine positioning point 305 and the lower end width". w 2 The "adjusting position and attitude of the deflection positioning line 205, the stationary blade positioning point 207, and the suction surface positioning line 206" includes:

[0114] Align the bionic spine positioning point 305 with the stationary blade positioning point 207; align the lower end width w2 with the deflection positioning line 205; and make the bionic spine cross section perpendicular to the plane containing the deflection positioning line 205 and the suction surface positioning line 206.

[0115] In some embodiments, step S140, "integrating the three-dimensional biomimetic spine structure 3 as a compressor flow channel control component into the compressor flow channel 1", includes:

[0116] Step S1403: Adjust the height of the target spine. H The upper width of the target w 1 The first spine position parameters and the second spine position parameters are used to obtain different three-dimensional biomimetic spine structures 3;

[0117] Step S1404: The different three-dimensional biomimetic spine structures 3 are integrated into the compressor flow channel 1 wall end as compressor flow channel control components.

[0118] The first spine position parameters include the leading edge positioning line and the axial positioning line. The second spine position parameters include the suction surface positioning line, the stationary blade positioning point, and the deflection positioning line.

[0119] By changing the distance between the axial positioning line and the leading edge positioning line in the first spine position parameters, changing the deflection angle between the suction surface positioning line and the deflection positioning line in the second spine position parameters, changing the distance between the suction surface positioning line and the suction surface segment, and changing the position of the stationary blade positioning point, the chord length of the three-dimensional bionic spine can be altered. L b This allows for the creation of different three-dimensional biomimetic spine structures.

[0120] Figure 7 This is a schematic diagram of the compressor flow channel provided in an embodiment of the present invention. Figure 8 for Figure 7 BB cross-sectional view of the flow channel of the intermediate-pressure air compressor. Figure 9 for Figure 7 CC cross-sectional view of the flow channel of the intermediate-pressure gas turbine.

[0121] like Figures 7 to 9 As shown, due to the significant pressure gradient change from the inlet to the outlet of the compressor flow channel, and the different flow separation intensities at different chord lengths of the suction surface of the stationary blades, different three-dimensional biomimetic ridge structures are constructed and integrated as compressor flow channel control components at different positions on the compressor flow channel wall. This allows for precise control of local flow characteristics within the flow channel, maximizing the suppression of flow separation and improving aerodynamic efficiency.

[0122] Figure 10The distribution diagram of the total outlet pressure loss coefficient along the dimensionless blade height is provided for an embodiment of the present invention. Figure 10 As shown, in some embodiments, a three-dimensional biomimetic ridge structure is installed in the flow channel of the high-speed, high-load compressor blade end region. For example, the distance between the axial positioning line and the leading edge positioning line is set to 30 mm, and the distance between the suction surface positioning line and the suction surface segment is set to 5 mm. Computational fluid dynamics was used to numerically simulate the original geometry of the three-dimensional compressor and the compressor flow channel geometry with the three-dimensional biomimetic ridge geometry in this embodiment. A comparison of the total pressure loss coefficient distribution along the dimensionless blade height at the outlet section (0.4 chord length behind the blade trailing edge) shows that the three-dimensional biomimetic ridge structure designed using the compressor flow channel control component design method based on the biomimetic ridge of this invention has a significant beneficial effect on the flow channel end region, significantly improving the total pressure loss in the flow channel end region. Although the loss increases somewhat in the middle section of the blade, the overall effect is a significant positive gain under the blocking, inducing, and guiding effects of the three-dimensional biomimetic ridge structure, significantly suppressing the expansion of secondary flow and improving the flow capacity of the blade channel.

[0123] In addition, the beneficial effects of this invention are reflected in (1) demonstrating an effective modeling method for extracting the shape of biomimetic structures, providing new ideas for the modeling and application of various biomimetic structures in other fields, and enabling rapid and homogeneous verification of the effectiveness of other biomimetic structures. (2) addressing the problem of secondary flow in the compressor channel caused by the transverse pressure gradient on the end wall of the internal flow channel of a high-load compressor, a systematic research method for studying the arrangement position and overall structural changes of the three-dimensional biomimetic ridge structure is provided through the quantification and positioning quantification methods of the three-dimensional biomimetic ridge structure, thereby improving the operating efficiency of the high-load compressor. (3) the first and second ridge position parameters provide rapid positioning for subsequent verification of the biomimetic ridge at multiple positions on the end wall of the high-load compressor, making up for the shortcomings of the new generation of high-load compressors in end wall separation control, and having important engineering application prospects.

[0124] It should be noted that the descriptions of the above device embodiments are similar to those of the above method embodiments, and have similar beneficial effects. For technical details not disclosed in the system embodiments of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0125] It should be noted that, in the embodiments of this application, if the above-described design method for a compressor flow channel control component based on a biomimetic spine is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a magnetic disk, or an optical disk. Thus, the embodiments of this application are not limited to any specific hardware and software combination.

[0126] Correspondingly, embodiments of this application provide a computer-readable storage medium storing a computer program thereon. When executed by a processor, this computer program implements the steps in the design method of the compressor flow channel control component based on a biomimetic spine described in any of the above embodiments. Correspondingly, embodiments of this application also provide a computer program product. When executed by a processor of an electronic device, this computer program product is used to implement the steps in the design method of the compressor flow channel control component based on a biomimetic spine described in any of the above embodiments.

[0127] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0128] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0129] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0130] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected to achieve the purpose of the embodiments of this application according to actual needs. In addition, each functional unit in the embodiments of this application may be fully integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in hardware or in the form of hardware plus software functional units.

[0131] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause the device automatic test line to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0132] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined to obtain new method embodiments without conflict. The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined to obtain new method embodiments or device embodiments without conflict.

[0133] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A design method for a compressor flow channel control component based on a biomimetic spine, characterized in that, include: Obtain an image of a leatherback turtle's dorsal spine specimen, extract the dorsal spine contour curve from the image, extract contour control points from the dorsal spine contour curve to obtain a contour control point sequence, and generate fitting curves for both sides of the dorsal spine based on the contour control point sequence. Using the target spine height and the target upper width as control variables, two curves in the fitting curves of the two spines on both sides are scaled and offset to obtain a bionic spine cross section that maintains the original contour of the fitting curves of the two spines on both sides. The lower width of the bionic spine cross section is determined based on the target spine height, the target upper width and the shape of the original contour. Obtain the blade geometry data of the compressor stationary blade, fit the blade geometry data, and obtain the first back ridge position parameter associated with the compressor stationary blade; The second back ridge position parameter is determined based on the first back ridge position parameter, and the axial guide profile of the back ridge is obtained based on the first back ridge position parameter and the second back ridge position parameter; the first back ridge position parameter includes the leading edge positioning line and the axial positioning line; the second back ridge position parameter includes the suction surface positioning line, the stationary blade positioning point and the deflection positioning line; Based on the lower end width, the position parameters of the third ridge are determined; the position parameters of the third ridge include the bionic ridge positioning point and the lower end width; after adjusting the position and posture of the bionic ridge section according to the second ridge position parameters and the third ridge position parameters, it is laid out along the axial guide line of the ridge to generate a three-dimensional bionic ridge structure; the three-dimensional bionic ridge structure is integrated into the compressor flow channel as a compressor flow channel control component.

2. The method according to claim 1, characterized in that, The step of extracting the vertebral contour curve from the image of the vertebral specimen includes: Import the image of the spine specimen into the Catia software; Using the key point addition function of the Catia software, a key point is added every first preset distance along the ridge outline of the leatherback turtle's back in the image of the turtle's back, resulting in multiple key points. Using the curve fitting function of the Catia software, the multiple key points are connected sequentially with curves to obtain the spine contour curve.

3. The method according to claim 2, characterized in that, The extraction of contour control points from the spine contour curve to obtain a contour control point sequence includes: Using the coordinate calibration function of GetData, the line connecting the lowest points of the two sides of the spine contour curve is taken as the x-axis, and a perpendicular line is drawn from the vertex of the spine contour curve to the line connecting the lowest points, and the perpendicular line is taken as the y-axis to establish a two-dimensional coordinate system. Using the segmented sampling function of GetData, along the x-axis direction in the two-dimensional coordinate system, between adjacent key points, the encrypted points in the spine contour curve are extracted at a second preset distance. The key points and the encrypted points are arranged according to the x-axis coordinate size to obtain the contour control point sequence; the second preset distance is less than the first preset distance.

4. The method according to claim 3, characterized in that, The step of generating bilateral ridge fitting curves based on the contour control point sequence includes: From the sequence of contour control points, control points with positive x-axis coordinates are selected to obtain positive control points; Using the first curve fitting model, the distribution of the positive control points on the y-axis is optimized, and the positive control points are fitted onto a smooth curve to obtain the right ridge fitting curve. The right ridge fitting curve is symmetrically mapped with the y-axis as the axis of symmetry to generate the left ridge fitting curve. The right back spine fitting curve and the left back spine fitting curve together constitute the two back spine fitting curves.

5. The method according to claim 4, characterized in that, The process of scaling and offsetting two curves in the fitted curves of the two sides of the spine, using the target spine height and the target upper width as control variables, to obtain a biomimetic spine cross-section that maintains the original contour of the fitted curves of the two sides of the spine, includes: Determine the target spine height of the fitted curves of the two spines; The two curves of the fitted curves of the two sides of the spine are scaled on the y-axis until the height of the two curves reaches the target spine height. Determine the target upper width of the fitted curves of the two lateral spines; The two curves of the fitted curves of the two sides of the spine are offset in opposite directions on the x-axis until the distance between the upper ends of the two curves is equal to the upper width of the target. After scaling and offsetting the fitted curves of the two sides of the spine, a biomimetic spine cross section that retains the original contour of the fitted curves of the two sides of the spine is obtained.

6. The method according to claim 1, characterized in that, The process of acquiring the blade geometry data of the compressor stationary blades and fitting the blade geometry data to obtain the first ridge position parameter associated with the compressor stationary blades includes: Acquire data on the suction surface section, leading edge section, and chord length of the stationary blade; Based on the static blade suction surface segment data, the coordinate control points of the static blade suction surface segment are extracted to obtain a three-dimensional suction surface segment control point sequence. Based on the leading edge segment data, the leading edge positioning line is determined; At a third preset distance offset from the leading edge positioning line along the negative x-axis, a line parallel to the leading edge positioning line is drawn to generate an axial positioning line.

7. The method according to claim 6, characterized in that, The step of determining the second ridge position parameter based on the first ridge position parameter, and obtaining the ridge axial guide profile based on the first ridge position parameter and the second ridge position parameter, includes: Based on the second curve fitting model, the sequence of control points of the suction surface segment is fitted to obtain the fitting formula of the suction surface positioning line. Based on the leading edge positioning line and the fourth preset distance, the starting point of the suction surface positioning line is determined; The suction surface positioning line is positioned based on the starting point of the suction surface positioning line and the fitting formula; The stationary blade positioning point is determined based on the intersection of the suction surface positioning line and the axial positioning line. The stationary blade positioning point is determined as the starting point of the axial guide profile of the spine. The length of the axial guide profile of the spine is determined based on the chord length of the stationary blade. Using the stationary blade positioning point as the rotation center, the axial positioning line is rotated by a preset deflection angle to obtain the deflection positioning line; The axial guide line of the spine is positioned based on its starting point, length, deflection positioning line, and suction surface positioning line.

8. The method according to claim 7, characterized in that, Based on the lower end width, the position parameters of the third ridge are determined; after adjusting the position and orientation of the bionic ridge section according to the second and third ridge position parameters, it is laid out along the axial guide line of the ridge to generate a three-dimensional bionic ridge structure, including: The midpoint of the lower width is used as the bionic spine positioning point; After adjusting the position and posture of the biomimetic spine section according to the biomimetic spine positioning point, the lower end width, the deflection positioning line, the stationary blade positioning point and the suction surface positioning line, it is laid out along the spine axial guide line to generate a three-dimensional biomimetic spine structure.

9. The method according to claim 8, characterized in that, The step of adjusting the position and attitude of the bionic spine section according to the bionic spine positioning point, the lower end width, the deflection positioning line, the stationary blade positioning point, and the suction surface positioning line includes: Align the biomimetic spine positioning point with the stationary blade positioning point; Align the lower end width with the deflection positioning line; The biomimetic spine section is perpendicular to the plane containing the deflection positioning line and the suction surface positioning line.

10. The method according to claim 1, characterized in that, The method of integrating the three-dimensional biomimetic spine structure as a compressor flow channel control component into the compressor flow channel includes: By adjusting the height of the target spine, the width of the upper end of the target, the position parameters of the first spine and the second spine, different three-dimensional biomimetic spine structures can be obtained. The different three-dimensional biomimetic spine structures are used as compressor flow channel control components and integrated into the compressor flow channel wall.

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